摘要
通过暴雨堵塞试验,研究了新型再生透水混凝土(NRPC)的抗堵塞性能,分析了NRPC孔径(d)和堵塞物粒径(r)对NRPC堵塞结构、透水系数、堵塞深度和堵塞物通过率的影响.结果表明:NRPC形成的堵塞结构由孔径和堵塞物粒径的比值(d/r)共同决定,暴雨作用后的堵塞结构分为单颗粒表面堵塞、单颗粒孔道堵塞和多颗粒孔道堵塞;透水系数的降低主要发生在第1次暴雨堵塞循环中,小粒径堵塞物(r <1.18 mm)形成的多颗粒堵塞是造成NRPC透水系数降低的主要原因;随着d/r的增加,多颗粒孔道堵塞结构的稳定性不断降低,当d>r时,d/r越小,NRPC孔道堵塞的深度越大;随着d/r的增加,堵塞物的通过率不断增加,孔道的筛选作用降低.
The clogging resistance of novel recycled pervious concrete(NRPC)was studied by designing a clogging test under the environment of rainstorm with a view to analyze the influence of pore diameter of NRPC(d)and particle size(r)of clogging materials on clogging structure,permeability coefficient,clogging depth and clogging material passing ratio.The results show that the clogging structure of NRPC is determined by the ratio of pore diameter to clogging material particle size(d/r).The clogging structure can be divided into single particle surface clogging,single particle pore channel clogging and multi particle pore channel clogging after rainstorms.The decrease of permeability coefficient mainly occurs in the first rainstorm clogging cycle.Multi particle clogging caused by small particle size clogging materials(r<1.18 mm)is the main reason for the decrease of NRPC permeability coefficient.With the increase of d/r,the stability of multi particle pore channel clogging structure decreases.When d>r,the smaller d/r is,the deeper the NRPC pore channel is clogging.With the increase of d/r,the passing ratio of clogging materials increases,and the screening effect of pore channels decreases.
作者
朱平华
史志浩
严先萃
杨磊
宗美荣
ZHU Pinghua;SHI Zhihao;YAN Xiancui;YANG Lei;ZONG Meirong(School of Urban Construction,Changzhou University,Changzhou 213164,China)
出处
《建筑材料学报》
EI
CAS
CSCD
北大核心
2023年第10期1088-1095,共8页
Journal of Building Materials
基金
国家自然科学基金资助项目(51878081)
江苏省研究生科研与实践创新计划项目(KYCX21_2847)。
关键词
透水混凝土
孔道堵塞
透水系数
孔径
堵塞物粒径
pervious concrete
pore channel clogging
permeability coefficient
pore diameter
clogging material diameter
